2645890265 has 8 divisors (see below), whose sum is σ = 3205894848. Its totient is φ = 2096161200.

The previous prime is 2645890259. The next prime is 2645890271. The reversal of 2645890265 is 5620985462.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2645890259) and next prime (2645890271).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2645890265 - 2¹⁶ = 2645824729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2568311 + ... + 2569340.

It is an arithmetic number, because the mean of its divisors is an integer number (400736856).

Almost surely, 2^2645890265 is an apocalyptic number.

It is an amenable number.

2645890265 is a deficient number, since it is larger than the sum of its proper divisors (560004583).

2645890265 is a wasteful number, since it uses less digits than its factorization.

2645890265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5137759.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The square root of 2645890265 is about 51438.2179415267. The cubic root of 2645890265 is about 1383.1117669365. Note that the first 3 decimals are identical.

The spelling of 2645890265 in words is "two billion, six hundred forty-five million, eight hundred ninety thousand, two hundred sixty-five".